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Various reaction mechanisms Reaction mechanisms at QE region QE with FSI violates the above simple relation FSI MEC If pion or nucleon cannot be observed, they are misidentified as QE We need to reconstruct the neutrino flux without using‘ideal’QE.

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The Objective Reconstruct the Neutrino Flux by using Maximum Entropy Method observable Flux averaged distribution of muon energy and scattering angle Inclusive cross section of muon production Neutrino Flux Without assuming QE, using only information of inclusive cross section, can we reconstruct the neutrino flux?

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Original Flux Reconstructed Flux by MEM Default Model Original Flux Without oscillation Constant Dependence of default model is not much. We use the model of without oscillation. Default Model | The prior information of the flux

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MEM ‘data’of muon distribution Reconstructed Neutrino Flux

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６． Summary  We proposed a method of reconstruction the neutrino flux from muon distribution in inclusive neutrino nucleus charged current reaction.  We regarded the reconstruction problem as the Inverse problem and use maximum entropy method. reconstruct neutrino flux without assuming CCQE.  The neutrino flux was successfully reconstructed. MEM